title: Stabilization of a magnetic nano-adsorbent by extracted pectin to remove methylene blue from aqueous solution: a comparative studying between two kinds of cross-linked pectin.
abstract: The removal of methylene blue (MB) as a cationic dye from aqueous solution by the stabilized Fe(3)O(4) nano-particles with the extracted pectin from apple waste (FN-PA) increased due to using the cross-linked forms of the bound pectin on the nano-particles surface by glutaraldehyde (FN-PAG) and adipic acid (FN-PAA) as the cross-linking agents. This increase happened in spite of binding some of the adsorbent functional groups of pectin with nano-particles. It can be due to the local concentrate of other free functional groups after connecting with nano-scale particles. Thermodynamic studies showed that the adsorption equilibrium constant and the maximum adsorption capacities increased with increasing temperature for all of the nano-bioparticles. The kinetic followed the second-order models with the highest rate constants viz. 16.23, 19.76 and 23.04 (× 10(-3)g/mg min) by FN-PAA. The adsorption force arrangement of MB by these nano-biosorbents regarding their activation energy was obtained as: FN-PAA>FN-PAG>FN-PA.
authors.affiliation: Department of Applied Chemistry, Faculty of Science, Islamic Azad University, Rasht Branch, PO Box 41335-3516, Rasht, Iran. rakhshaei@iaurasht.ac.ir
authors.forename: Roohan
authors.initials: R
authors.lastname: Rakhshaee
authors.forename: Mohammad
authors.initials: M
authors.lastname: Panahandeh
mesh_terms: D000272:Adipates; D000327:Adsorption; D003432:Cross-Linking Reagents / Q000737:chemistry*; D005976:Glutaral; D007700:Kinetics; D008280:Magnetics; D008751:Methylene Blue / Q000302:isolation & purification*; D053758:Nanoparticles / Q000737:chemistry*; D010368:Pectins / Q000737:chemistry*; D012996:Solutions; D013816:Thermodynamics
chemical_list: D000272:Adipates; D003432:Cross-Linking Reagents; D012996:Solutions; C029900:adipic acid; D010368:Pectins; D005976:Glutaral; D008751:Methylene Blue